diff --git a/gitinspector/terminal.py b/gitinspector/terminal.py
index 4be4bed..51ab38f 100644
--- a/gitinspector/terminal.py
+++ b/gitinspector/terminal.py
@@ -118,8 +118,9 @@ def convert_command_line_to_utf8():
 	try:
 		argv = []
 
+		encoding = sys.stdin.encoding or sys.getdefaultencoding()
 		for arg in sys.argv:
-			argv.append(arg.decode(sys.stdin.encoding, "replace"))
+			argv.append(arg.decode(encoding, "replace"))
 
 		return argv
 	except AttributeError: